Analysis

  • max time kernel
    142s
  • max time network
    148s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    23/01/2025, 02:10

General

  • Target
    18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe
  • Size 1.8MB
  • Sample250123-cl26jsxjev
  • SHA256 18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919
  • MD5 SHA1 SHA512 SSDEEP

Malware Config

Signatures

  • DcRat

    DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

  • Dcrat family
  • Modifies WinLogon for persistence 2 TTPs 6 IoCs
  • Process spawned unexpected child process 18 IoCs

    This typically indicates the parent process was compromised via an exploit or macro.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 6 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Reads user/profile data of web browsers 3 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Adds Run key to start application 2 TTPs 12 IoCs
  • Drops file in System32 directory 2 IoCs
  • Drops file in Windows directory 9 IoCs
  • Browser Information Discovery 1 TTPs

    Enumerate browser information.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Modifies registry class 1 IoCs
  • Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 8 IoCs
  • Suspicious use of WriteProcessMemory 24 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe
    "C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Checks computer location settings
    • Adds Run key to start application
    • Drops file in Windows directory
    • Modifies registry class
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:3152
    • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\jw5xwjff\jw5xwjff.cmdline"
      2⤵
      • Drops file in System32 directory
      • Suspicious use of WriteProcessMemory
      PID:1504
      • C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESC217.tmp" "c:\Windows\System32\CSCDBDBBA27BCDC495ABE9C98DF882C5D68.TMP"
        3⤵
          PID:3148
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\Logs\Telephony\csrss.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:4580
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\Offline Web Pages\System.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:2112
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Default\Application Data\StartMenuExperienceHost.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1132
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\debug\RuntimeBroker.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:4996
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\assembly\tmp\RuntimeBroker.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:1896
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe'
        2⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious use of AdjustPrivilegeToken
        PID:2444
      • C:\Windows\System32\cmd.exe
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\tVgQRvzxRx.bat"
        2⤵
        • Suspicious use of WriteProcessMemory
        PID:1124
        • C:\Windows\system32\chcp.com
          chcp 65001
          3⤵
            PID:956
          • C:\Windows\system32\w32tm.exe
            w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
            3⤵
              PID:224
            • C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe
              "C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe"
              3⤵
              • Suspicious behavior: GetForegroundWindowSpam
              • Suspicious use of AdjustPrivilegeToken
              PID:1000
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 14 /tr "'C:\Windows\Logs\Telephony\csrss.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2088
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\Logs\Telephony\csrss.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4796
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 11 /tr "'C:\Windows\Logs\Telephony\csrss.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2284
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 11 /tr "'C:\Windows\Offline Web Pages\System.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:5076
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Windows\Offline Web Pages\System.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2292
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 5 /tr "'C:\Windows\Offline Web Pages\System.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4824
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 9 /tr "'C:\Users\Default\Application Data\StartMenuExperienceHost.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2864
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Users\Default\Application Data\StartMenuExperienceHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3992
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 14 /tr "'C:\Users\Default\Application Data\StartMenuExperienceHost.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4572
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\debug\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1428
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\debug\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1908
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 10 /tr "'C:\Windows\debug\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2600
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 5 /tr "'C:\Windows\assembly\tmp\RuntimeBroker.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:1968
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\assembly\tmp\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4496
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 7 /tr "'C:\Windows\assembly\tmp\RuntimeBroker.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4704
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c9191" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe'" /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:3656
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:2660
        • C:\Windows\system32\schtasks.exe
          schtasks.exe /create /tn "18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c9191" /sc MINUTE /mo 9 /tr "'C:\Users\Admin\AppData\Local\Temp\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe'" /rl HIGHEST /f
          1⤵
          • Process spawned unexpected child process
          • Scheduled Task/Job: Scheduled Task
          PID:4088

        Network

              MITRE ATT&CK Enterprise v15

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919.exe.log
              • Size 1KB
              • SHA256 7521ee2d065a78efcab55a194fbd78492f84b70595f139263875f4ea92b194d6
              • MD5 SHA1 SHA512

              powershell.exe.log

              • Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
              • Size 2KB
              • SHA256 8ef7a682dfd99ff5b7e9de0e1be43f0016d68695a43c33c028af2635cc15ecfe
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 944B
              • SHA256 21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45
              • MD5 SHA1 SHA512

              StartupProfileData-NonInteractive

              • Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
              • Size 64B
              • SHA256 a147f4fb3ba4dee9197d7192ce22385e2c5da6987ab044bd2d2d2b7adac71c4a
              • MD5 SHA1 SHA512

              RESC217.tmp

              • Path C:\Users\Admin\AppData\Local\Temp\RESC217.tmp
              • Size 1KB
              • SHA256 a65e9b1833b3c3d2036fb6a2dde238b54db6179c3b89a9457f6d6bdc0c30d1dc
              • MD5 SHA1 SHA512

              __PSScriptPolicyTest_fjdkwgve.24j.ps1

              • Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_fjdkwgve.24j.ps1
              • Size 60B
              • SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
              • MD5 SHA1 SHA512

              tVgQRvzxRx.bat

              • Path C:\Users\Admin\AppData\Local\Temp\tVgQRvzxRx.bat
              • Size 278B
              • SHA256 d87572ac8fc637dbe0d741bae32399471ca94434e430c838a05f7e6af887fe20
              • MD5 SHA1 SHA512

              csrss.exe

              • Path C:\Windows\Logs\Telephony\csrss.exe
              • Size 1.8MB
              • SHA256 18a6abdb4cbcda4ac8cd3dcfeed13ff1506b6355912f6a7f479fdcd4a3f2c919
              • MD5 SHA1 SHA512 SSDEEP

              jw5xwjff.0.cs

              • Path \??\c:\Users\Admin\AppData\Local\Temp\jw5xwjff\jw5xwjff.0.cs
              • Size 367B
              • SHA256 00732f0d24828e267c12fb2812cbe78c9132b189d84ecb090ecada7d71840904
              • MD5 SHA1 SHA512

              jw5xwjff.cmdline

              • Path \??\c:\Users\Admin\AppData\Local\Temp\jw5xwjff\jw5xwjff.cmdline
              • Size 235B
              • SHA256 8e1a04bfd2dc70cb2f3e39ee7a8cd4d6086856ba4c123c009a71e79e21110a96
              • MD5 SHA1 SHA512

              CSCDBDBBA27BCDC495ABE9C98DF882C5D68.TMP

              • Path \??\c:\Windows\System32\CSCDBDBBA27BCDC495ABE9C98DF882C5D68.TMP
              • Size 1KB
              • SHA256 12b900db56a20f01f0f1d65f46933971415d5b5675e59e8b02b3dae12aaa1527
              • MD5 SHA1 SHA512

              memory/1000-124-0x000000001BB00000-0x000000001BBA9000-memory.dmp

              memory/2112-59-0x000001E6713E0000-0x000001E671402000-memory.dmp

              memory/3152-10-0x0000000002D80000-0x0000000002D9C000-memory.dmp

              memory/3152-11-0x000000001B930000-0x000000001B980000-memory.dmp

              memory/3152-30-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-28-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-17-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-15-0x0000000002D50000-0x0000000002D5C000-memory.dmp

              memory/3152-13-0x000000001B8E0000-0x000000001B8F8000-memory.dmp

              memory/3152-48-0x000000001BF00000-0x000000001BFA9000-memory.dmp

              memory/3152-49-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-29-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-0-0x00007FFA105F3000-0x00007FFA105F5000-memory.dmp

              memory/3152-8-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-5-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-7-0x0000000002D40000-0x0000000002D4E000-memory.dmp

              memory/3152-4-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-3-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-2-0x00007FFA105F0000-0x00007FFA110B1000-memory.dmp

              memory/3152-1-0x0000000000AA0000-0x0000000000C7A000-memory.dmp